I wondered if anyone would notice that mag.
AFAIK it's an original. We bought and moved into my in-laws house after my FiL passed and my MiL couldn't stay alone anymore. I was cleaning out a kitchen cabinet and found a ball of twine wrapped around something. I started unraveling the twine and saw the bottom of the mag so I went to town unraveling the twine as fast as I could and I figured the blue was worn away because of being wrapped up in twine. When I started getting deeper into 1911s I started seeing references to 2 tone mags so I posted it on a couple of 1911 forums and the consensus was it's an original 2 tone. FiL was something of a pack rat so there's no telling how or when he came by it.